| Impact ID | 4605 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Phalaris arundinacea replaced wetland plants in Portland, Oregon, creating monotopic stands and changing and dominating the canopy cover in the systems. |
| Reference | 36923 |
| Great Lakes Region | No |
| Cost | |
| Location | Portland, OR, USA |
